目的 以鲜切胡萝卜作为包装对象，研究聚乙烯（PE）薄膜、聚乳酸（PLA）薄膜、笼型聚倍半硅氧烷（POSS）改性PLA薄膜、硅橡胶（SR）薄膜以及改性SR薄膜对胡萝卜保护效果的差异。方法 通过傅里叶红外技术和紫外-可见光谱技术对包装膜的结构和性能进行检测，并测定不同包装下胡萝卜素含量的变化及胡萝卜的质量损失率。结果 不同类型的包装膜对鲜切胡萝卜的保护效果不同，尤其是胡萝卜素的保留率有较大差异。改性SR膜的紫外光谱透过率低，其对鲜切胡萝卜的胡萝卜素的保护功能最佳，水分保有率也较高；PE薄膜的紫外透过性高，对胡萝卜素的保护功能较差，但包装的鲜切胡萝卜质量损失率最小；POSS-PLA薄膜和PLA薄膜对胡萝卜素的保护作用居中，鲜切胡萝卜质量损失率高。结论 在实际包装应用中可以考虑将改性SR薄膜与PE薄膜组合使用。

The paper aims to research effects of polyethylene (PE) film, polylactic acid (PLA) film, polyhedral oligomeric silsesquioxane (POSS) modified PLA film, silicone rubber (SR) film and modified SR film on carrot protection were studied with freshly cut carrots as packaging objects. The structure and properties of the packaging film were tested by Fourier transform infrared spectroscopy and ultraviolet-visible spectroscopy, and the change of carotene content and the weight loss rate of carrot in different packaging were determined. Different packaging films had different protection effects on freshly cut carrots, especially on the retention rate of carotene. The modified SR film had a low UV spectrum transmittance. It had the best protection function for the freshly cut carrot carotene and a high water retention rate. The PE membrane had high UV permeability and poor protection for carotene, but the weight loss rate of freshly cut carrots in packaging was the smallest. POSS-PLA membrane and PLA membrane had a moderate protective effect on carotene, and high weight loss rate of freshly cut carrots. In the actual packaging application, the combined use of modified SR film and PE film can be considered.